--- ../src-base/minecraft/net/minecraft/block/BlockSlab.java
+++ ../src-work/minecraft/net/minecraft/block/BlockSlab.java
@@ -80,6 +80,19 @@
         return this.func_176552_j();
     }
 
+    @Override
+    public boolean doesSideBlockRendering(IBlockState state, IBlockAccess world, BlockPos pos, EnumFacing face)
+    {
+        if (net.minecraftforge.common.ForgeModContainer.disableStairSlabCulling)
+            return super.doesSideBlockRendering(state, world, pos, face);
+
+        if ( state.func_185914_p() )
+            return true;
+
+        EnumBlockHalf side = state.func_177229_b(field_176554_a);
+        return (side == EnumBlockHalf.TOP && face == EnumFacing.UP) || (side == EnumBlockHalf.BOTTOM && face == EnumFacing.DOWN);
+    }
+
     public IBlockState func_180642_a(World p_180642_1_, BlockPos p_180642_2_, EnumFacing p_180642_3_, float p_180642_4_, float p_180642_5_, float p_180642_6_, int p_180642_7_, EntityLivingBase p_180642_8_)
     {
         IBlockState iblockstate = super.func_180642_a(p_180642_1_, p_180642_2_, p_180642_3_, p_180642_4_, p_180642_5_, p_180642_6_, p_180642_7_, p_180642_8_).func_177226_a(field_176554_a, BlockSlab.EnumBlockHalf.BOTTOM);
@@ -115,7 +128,7 @@
         {
             return false;
         }
-        else
+        else if (false) // Forge: Additional logic breaks doesSideBlockRendering and is no longer useful.
         {
             IBlockState iblockstate = p_176225_2_.func_180495_p(p_176225_3_.func_177972_a(p_176225_4_));
             boolean flag = func_185675_i(iblockstate) && iblockstate.func_177229_b(field_176554_a) == BlockSlab.EnumBlockHalf.TOP;
@@ -149,6 +162,7 @@
                 return !func_185675_i(iblockstate) || flag;
             }
         }
+        return super.func_176225_a(p_176225_1_, p_176225_2_, p_176225_3_, p_176225_4_);
     }
 
     @SideOnly(Side.CLIENT)